Abstract
In recent years, many compounds have been proposed as additives to conventional working fluids to improve the performance of the absorption refrigeration system. The main aim of this research is to show the influence of ionic liquid based additives on thermodynamic and physicochemical properties of {LiBr + water} solutions. The following additives: 3-(1-methyl-morpholinium)propane-1-sulfonate, N,N-di(2-hydroxyethyl)-N,N-dimethylammonium bromide, and N,N,N-tri(2-hydroxy-ethyl)-N-methylammonium bromide have been added to aqueous lithium bromide solutions (IL to LiBr mass fraction, w2 = 0.3). The physicochemical and thermodynamic properties of {LiBr (1) + additive (2) + water (3)} and {LiBr + water} systems including (vapor + liquid) phase equilibria (VLE), density (ρ) and dynamic viscosity (η) were determined over wide temperature and composition ranges. The conductor-like screening model for real solvents (COSMO-RS) was used for the VLE data prediction. For the density and dynamic viscosity correlations, empirical equations were applied. A comparison of experimental data for {LiBr + additive + water} with those for {LiBr + water} systems shows the influence of using the additives proposed in this work. The data presented are complementary to the current state of knowledge in this area and provide directions for future research.
Highlights
Concerns about the impact of human related activities and its impact on the environment, as evident in climate change, have altered human behavior in a need to protect the natural environment and save energy and resources
In previous papers regarding the crystallization of the LiBr + water mixtures in the presence of an ionic liquids (ILs) or ZI additive, we identified that the greatest increase in solubility of LiBr in water was observed when [MOR1,3SO3] was added
To verify the experimental method, these properties were measured for aqueous lithium bromide solution and were consistent with available literature data
Summary
Concerns about the impact of human related activities and its impact on the environment, as evident in climate change, have altered human behavior in a need to protect the natural environment and save energy and resources Following this trend, interest in absorption cooling devices as a “greener” alternative to compressor devices has increased significantly in recent. Journal of Solution Chemistry (2021) 50:473–502 years Cold production in these devices is realized by the thermal compressor which uses environmentally friendly refrigerants. This technology can operate without the need of (large quantities) electricity since waste or surplus heat is used as an energy source. The search for new working pairs with more favorable properties has gained importance and is being investigated by research groups around the world [5,6,7,8,9,10]
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